In the world of Facebook, Instagram and other social media platforms, we typically find someone by their username. On messenger apps, however, we still largely find and save a new contact with a telephone number. That’s changing in an upcoming version of privacy-oriented WhatsApp rival, Signal, which is trialling a new feature allowing people to keep their phone number hidden and be found with a unique username instead. What difference does this make to users? It means in future you’ll be able to search for a contact with their name and not their phone number, while other users will also no lo…